Check your collant level If your radiator is full then you can place carboard in from and over the lower third of the radiator to block the air flow. Watch your temp guage to be sure you don't over heat the engine. If it still does not heat up pproperly you can block more of the air flow as l;ong as the neging temp guage is not showing it running hot. If it runs too hot remove some of the carboard allowing more air flow. THe proimary reasom for the heater not putting out warm air is low coolant, blocked water flow to the heater core or a bad thgermostadt (wrong thermostadt; one that opens at too low of a temp, defective thermostadt trhat is blocked open or even a missing thermostadt. Regardles what you do just be sure to watch the temp guage as you can do serious damage to your engine if you overheat it too much. Again, be sure you have the radiator topped off properly before you start
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